JP5864013B1 - Pipe set for drain pipe and installation method of drain pipe - Google Patents

Abstract

[PROBLEMS] To provide an appropriate slope for a drain pipe with little deterioration over time and sediment accumulation in the pipe, without requiring a pre-process such as drilling a natural ground, unless the natural ground is harder than a certain level. Hold it in the ground. A drain pipe 250 is formed by connecting a leading pipe 210, a first succeeding pipe 220, and a second succeeding pipe 220, which are metal oval pipes, in series. Push into and install. The upper part of the front end part 211 of the top pipe 210 is protruded from below, and the top part having a large curvature radius of the egg-shaped cross section is directed upward. An interval is provided between the contact surfaces at the connection point of each pipe so that the vertical direction is movable with respect to each other. [Selection] Figure 9

Description

  TECHNICAL FIELD The present invention relates to a drainage pipe set and a drainage pipe installation method, and more particularly to a drainage pipe set that constitutes a drainage pipe that can be installed in a natural ground, and a drainage pipe installation method. It is.

  In order to prevent sediment disasters, the pipe line (drainage pipe) made of pipes with drainage holes is inclined and buried in the ground, and then drained from the ground via the drainage holes into the drainage pipe. It is known to extract the exuded water from the ground surface (for example, slope) of the natural mountain to the outside. Many conventional drain pipes are made of a resin material such as vinyl chloride (see, for example, Patent Document 1), and are installed by being drawn into a hole in a drilled portion of a natural ground.

  If a drain pipe made of a resin material passes for a long time after installation, there is a risk of malfunction due to deterioration of the material over time. When replacing a malfunctioning drainage pipe with a new one in an emergency such as heavy rain or a typhoon, or newly installing a drainage pipe, it is necessary to drill a natural ground again. Since it is difficult to perform such time-consuming work in an emergency, first-aid measures such as covering the ground surface of a natural mountain (for example, slope) with a vinyl sheet to prevent further penetration of the ground into the ground are performed. .

  In order to reduce the effort of installing the drain pipe, for example, according to the drain pipe embedding method described in Patent Document 1, a drain pipe insertion hole having a diameter larger than the outer diameter of the drain pipe is formed in the ground. Then, a drain pipe formed of a flexible tubular fabric is inserted from the opening. According to Patent Document 1, it is described that the drainage pipe formed of a flexible tubular woven fabric has high water permeability and a certain degree of rigidity in the axial direction, and can be pushed into the drainage pipe insertion hole from the surface of the natural ground. Yes.

  However, according to the description of Patent Document 1, when the drainage pipe insertion hole is first formed, a preparatory process is performed in which a ground is previously drilled using a drilling machine, and a steel cylindrical guide pipe is inserted into the hole. is necessary. In order to prepare for emergencies such as disasters, it is desirable that such drain pipes can be installed as quickly and efficiently as possible.

JP 2010-070919 A

  The problem to be solved by the present invention is to ensure the function of draining the drainage pipe and to install the drainage pipe quickly and efficiently in the ground.

In order to solve the above-described problem, the pipe set for a drain pipe according to the present invention has an oval shape in which a curvature radius of the first top portion is larger than a curvature radius of the second top portion facing each other in a cross section perpendicular to the longitudinal direction. A plurality of metal pipes, wherein at least one water drain hole penetrating from the outside to the inside of the pipe is provided, and a plurality of metals that can constitute a drain pipe by being connected in series In the water drain pipe set comprising a pipe, the metal pipe is one of the plurality of metal pipes and has a front end and a rear end in the longitudinal direction, the front end is closed and the first top side is a head pipe of the side of the second top formed by protruding in the longitudinal direction, as well as organic a first end and a second end in the longitudinal direction a 1 of the plurality of metal pipes Said first end The top pipe can be connected, and said first top when coupled to the head pipe and the first end in the second top by but it is inserted into the rear end portion A first succeeding pipe formed so as to be able to maintain a predetermined interval between the outer periphery of the rear end and the rear end portion is provided.

In order to solve the above-described problem, the drainage pipe installation method according to the present invention is an egg in which the curvature radius of the first top portion is larger than the curvature radius of the second top portion facing each other in a cross section perpendicular to the longitudinal direction. A plurality of metal pipes having a shape, wherein at least one water drain hole penetrating from the outside to the inside of the pipe is provided, and a plurality of drain pipes can be configured by being connected in series among drain pipe pipe set of metal pipe, the of the side of the longitudinal direction front end and the rear end portion has the front end side is the second of the top of the first top with is closed It said first end with said rear end portion of the head pipe which is formed by protruding in the longitudinal direction, is closed a first end and a second end in the longitudinal direction a 1 of the plurality of metal pipes the part is inserted into the rear end portion And can be connected to the leading pipe and between the outer periphery of the first end and the rear end at the first top and the second top when connected to the leading pipe. The first end of a first succeeding pipe formed so as to be able to maintain a predetermined interval is inserted, and the plurality of metal pipes including the leading pipe and the first succeeding pipe are connected in series. The drainage pipe is configured to be connected to the head, and the drainage pipe is oriented in such a manner that the first top part and the second top part are directed upward and downward, respectively, and inserted in order from the top pipe into the natural ground The water drain pipe is press-fitted into the ground in the direction along which the drain pipe is inserted into the ground.

  Since the drain pipe constituted by the pipe set for drain pipe according to the present invention is made of metal, it has higher rigidity than the drain pipe according to the prior art including Patent Document 1 and can be pressed into the ground more quickly. And can be performed efficiently. Furthermore, the unique feature of the present invention that is not found in the prior art is that the drain pipe is an oval tube, and the front end of the front pipe heads upward due to the press-fitting into the ground due to the shape of the front end of the top pipe. It is a point that exhibits excellent drainage performance. That is, according to this invention, while ensuring the function of draining a drain pipe, a drain pipe can be installed in the ground quickly and efficiently.

FIG. 1 is a view showing the appearance of a drain pipe set according to Embodiment 1 of the present invention. (Example 1) FIG. 2 is a three-side view showing the leading pipe. (Example 1) FIG. 3 is a trihedral view showing the first subsequent pipe. (Example 1) FIG. 4 is a diagram showing the positional relationship between the first pipe and the first end of the first succeeding pipe inserted into the rear end of the leading pipe. (Example 1) FIG. 5 is a diagram illustrating a state in which the leading pipe is movably connected to the first subsequent pipe. (Example 1) FIG. 6 is a view showing a state in which the drain pipe is press-fitted into the ground from the slope of the natural ground. (Example 1) FIG. 7 is a view showing a state in which the drain pipe according to the modification is press-fitted into the ground from the slope of the natural ground. (Example 1) FIG. 8 is a diagram illustrating an appearance of a drain pipe set according to the second embodiment. (Example 2) FIG. 9 is a view showing a state in which the drain pipe is press-fitted into the ground from the slope of the natural ground. (Example 2)

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

  FIG. 1 is a view showing an appearance of a drain pipe set 100 according to a first embodiment of the present invention. The drain pipe set 100 includes a leading pipe 110 and a first subsequent pipe 120. The longitudinal direction of the leading pipe 110 and the first succeeding pipe 120 is indicated by broken-line arrows at the bottom of FIG. The leading pipe 110 and the first succeeding pipe 120 are both metal hollow pipes. The longitudinal lengths of the leading pipe 110 and the first succeeding pipe 120 may be set as appropriate. The drainage pipe set 100 may or may not include a metal hollow pipe (not shown) in addition to the leading pipe 110 and the first succeeding pipe 120 (referred to as additional succeeding pipes, the number of which is zero or more). Any value of).

  A left end portion (indicated by a dotted ellipse) in FIG. 1 of the leading pipe 110 is a front end portion 111. A right end portion of the leading pipe 110 in FIG. 1 (indicated by a dotted oval) is a rear end portion 112. The top pipe 110 is provided with a plurality of drain holes 113 that penetrate from the outside to the inside of the pipe except for the lower part in FIG. 1 (the reason for excluding the lower part is that the water in the pipe is underground. This is to prevent leakage into the water.) A lid 114 shown with hatching is attached to the front end 111, and the leading pipe 110 is closed by the lid 114 at the front end 111. The pipe end of the rear end portion 112 is not shown in FIG.

  The left end portion of the first subsequent pipe 120 in FIG. 1 (enclosed by a dotted oval) is the first end 121. A right end portion of the first subsequent pipe 120 in FIG. 1 (enclosed by a dotted oval) is a second end portion 122. The first succeeding pipe 120 is provided with a plurality of drain holes 113 penetrating from the outside to the inside of the pipe (represented with the same reference numerals because they are provided in the same manner as the leading pipe 110). . A plurality of drain holes 113 are also provided in each additional succeeding pipe (not shown) (when the number is 1 or more). The drain holes 113 are provided in any pipe except for the lower part.

  FIG. 2 is a three-side view of the leading pipe 110 viewed from one direction perpendicular to the longitudinal direction in FIG. 1 and from the left hand and the right hand (referred to as a left side view, a front view, and a right side view in order from the left). .) In addition, illustration of the several drain hole 113 is abbreviate | omitted. The configuration represented by the reference numerals 111, 112, and 114 in FIG. 2 is the same as the configuration represented by the same reference numerals in FIG.

  As shown in the left side view and the right side view of FIG. 2, the outer periphery and the hollow portion in the pipe in the cross section perpendicular to the longitudinal direction of the leading pipe 110 (the direction indicated by the broken arrow in FIG. 1) are oval. Make. That is, when the uppermost part in the left side view and the right side view is the first top part 115 and the lowermost part (the top part opposite to the first top part 115) is the second top part 116, the curvature radius of the first top part 115 is 2 The radius of curvature of the top 116 is larger. Further, as shown in the front view of FIG. 2, the front end portion 111 protrudes from the first top portion 115 side to the second top portion 116 side. The degree of the protrusion is, for example, in the range where the value of the angle θ shown in FIG. 2 is 35 degrees to 45 degrees (in the projection onto the plane).

  FIG. 3 is a three-side view of the first subsequent pipe 120 as viewed from the same direction as in FIG. 2 (referred to as a left side view, a front view, and a right side view in order from the left). In addition, illustration of the several drain hole 113 is abbreviate | omitted. The configuration represented by the reference numerals 121 and 122 in FIG. 3 is the same as the configuration represented by the same reference numerals in FIG.

  As shown in the left side view and the right side view of FIG. 2, the outer periphery and the hollow portion in the pipe in the cross section perpendicular to the longitudinal direction of the first subsequent pipe 120 (the direction indicated by the dashed arrow in FIG. 1) Oval shape. That is, the uppermost part and the lowermost part in the left side view and the right side view are defined as the first top part 115 and the second top part 116, respectively, similarly to the top pipe 110. Also in the first succeeding pipe 120, the curvature radius of the first top portion 115 is larger than the curvature radius of the second top portion 116, as in the leading pipe 110.

  It is assumed that the drain pipe set 100 includes one or more additional subsequent pipes (not shown). Each additional succeeding pipe has an oval shape in which the outer periphery and the hollow portion in the pipe have a first top portion 115 and a second top portion 116 in a cross section perpendicular to the longitudinal direction, similar to the leading pipe 110 and the first succeeding pipe 120. The curvature radius of the first top portion 115 is larger than the curvature radius of the second top portion 116.

  As will be described later, the leading pipe 110, the first succeeding pipe 120, and each additional succeeding pipe (not shown) are connected in series in this order to constitute a drain pipe. The constructed drain pipe has an oval shape in which a cross section perpendicular to the longitudinal direction has a first top portion 115 and a second top portion 116 at an arbitrary position in the longitudinal direction, and the curvature radius of the first top portion 115 is the second top portion. Greater than 116 radii of curvature. In other words, the first top portion 115 corresponds to the ridge line portion connecting the top portions of the oval cross section of the constructed drainage pipe with the larger curvature radius, and the second top portion 116 also connects the top portions with the smaller curvature radius. It corresponds to the ridgeline part.

  As shown in FIG. 2, the rear end 112 of the leading pipe 110 is formed with an inner and outer diameter enlarged while maintaining an oval cross section. This shape is, for example, relatively large with respect to the rear end 112 from the right in FIG. 2 with respect to a pipe formed with a uniform inner and outer diameter of the egg shape from the front end 111 to the rear end 112. A metal lump can be press-fitted and formed by a tube expansion process that presses the metal lump in a longitudinal direction between the metal mold and the mold matched to the shape of the rear end portion 112 shown in FIG. As a result, the first end 121 of the first subsequent pipe 120 can be inserted into the rear end 112 of the leading pipe 110.

  4 shows the positional relationship between the first end 121 of the first succeeding pipe 120 and the rear end 112 of the top pipe 110 when the first end 121 is inserted in the same direction as FIGS. It is the figure represented to sectional drawing seen from the right side in FIG. In the front view on the left side of FIG. 4, the first end 121 of the first subsequent pipe 120 is inserted into the rear end 112 of the leading pipe 110. 4 shows a state in which the first end portion 121 (only the outer periphery is shown) is inscribed in the pipe inner wall of the rear end portion 112.

  As shown in FIG. 4, the rear end portion 112 is formed in advance so as to maintain a distance h <b> 1 between the first top portion 115 and the outer periphery of the first end portion 121 when the first end portion 121 is inserted. . Similarly, the second top portion 116 is formed in advance so as to maintain a distance h <b> 2 from the outer periphery of the first end portion 121. As a result, for example, as shown in FIG. 5, the longitudinal direction of the leading pipe 110 is movable in the direction connecting the first apex 115 and the second apex 116 with respect to the longitudinal direction of the first subsequent pipe 120. FIG. 5 is a diagram illustrating a state in which the leading pipe 110 is movably connected to the first subsequent pipe 120 as viewed from the same direction as illustrated in the front view of FIG. 4.

  The symbol d shown in FIG. 4 corresponds to the depth of insertion when the first end 121 is inserted into the rear end 112. It is desirable that the ratio of h1 or h2 (which can be set to substantially the same value) to d be 1.5% or more for the reason described later. In addition, you may connect both by the well-known methods, such as a rivet, a volt | bolt nut, and a screw stop, in the location where the 1st end part 121 is inscribed in the rear-end part 112, for example. If it does so, the connection of the top pipe 110 and the 1st succeeding pipe 120 can be made more reliable, maintaining said mobility.

  The operation of the drain pipe 150 configured by connecting the leading pipe 110 and the first succeeding pipe 120 as described above will be described. FIG. 6 is a diagram illustrating a state in which the drain pipe 150 is pressed into the ground from the slope of the natural ground 20. Since the drain pipe 150 is made of metal and has high rigidity, the front end portion 111 of the leading pipe 110 is directed to the slope of the natural ground, and the second end portion 122 of the first succeeding pipe 120 is used by using a drilling machine or the like. The drain pipe 150 can be installed in the ground of the natural ground 20 by applying pressure and pushing in. Except for the case where the natural ground is harder than a certain level, a preparatory step for previously drilling the natural ground or providing a guide tube is not necessary.

  At this time, by directing the first top portion 115 and the second top portion 116 upward and downward, respectively, the front end portion 111 of the leading pipe 110 advances in the ground with the first top portion 115 side from which the tip protrudes upward. become. Therefore, an upward force acts on the front end portion 111 as the leading pipe 110 moves forward. Further, as described with reference to FIG. 5 regarding the vertical direction in FIG. 6, the leading pipe 110 is movable within a certain range with respect to the first subsequent pipe 120.

  As a result, when pressure is applied to the second end 122 of the first succeeding pipe 120 in the horizontal plane and the drain pipe 150 is pushed toward the slope of the natural ground 20, the leading pipe 110 gradually moves upward, As it is pushed toward the deep part of the head 20, the front end 111 is inclined upward. Then, the first succeeding pipe 120 connected to the leading pipe 110 at the first end 121 is also inclined with the first end 121 facing upward as it is pushed toward the deep part of the natural ground 20.

  Since the front end portion 111 of the leading pipe 110 is closed by a lid portion 114 (not shown in FIG. 6), entry and accumulation of earth and sand into the drainage pipe 150 are prevented. Since the first end portion 121 of the first succeeding pipe 120 is inserted into the rear end portion 112 of the leading pipe 110, the rear end portion 112 and the first end portion are inserted as the drain pipe 150 is press-fitted into the ground 20. It is possible to prevent earth and sand from entering the pipe from the 121 connecting points.

  That is, as shown in FIG. 6, the drainage pipe 150 is inclined with the front end portion facing upward, and is gently refracted at the connecting portion between the rear end portion 112 and the first end portion 121, and the ground of the natural ground 20. Installed inside. Since the leading pipe 110 and the first succeeding pipe 120 are each provided with a plurality of drain holes 113 penetrating from the outside to the inside of the pipe, moisture in the ground of the natural ground 20 passes through the drain hole 113 and the drain pipe 150 Exuded into the tube.

  Since the drainage pipe 150 is inclined with the tip portion facing upward, the moisture oozed into the pipe from the plurality of drainage holes 113 (not shown in FIG. 6) flows down the slope, and the first succeeding pipe. It is discharged to the ground surface through the second end 122 of 120. In addition, since the drainage pipe 150 is an oval pipe installed with the second top portion 116 having the smaller radius of curvature facing downward, even if the amount of water decreases, the decrease in the flow velocity is small, so sedimentation of sediment in the pipe does not occur. Therefore, it is possible to maintain a more stable drainage performance than a circular tube or an elliptical tube against changes in the amount of water. The characteristics of such an oval tube are well known in the field of sewerage and the like (for example, http://www.civil.chuo-u.ac.jp/lab/eisei/member/2008/jouguesui9.pdf) See).

  The value of the inclination of the drain pipe 150 in FIG. 6 is considered to finally approach the ratio of h1 or h2 to d shown in FIG. In order for water to flow smoothly along the slope, it is desirable that the slope is 1.5% or more in terms of hydraulics. Therefore, it is desirable that the ratio of h1 or h2 to d shown in FIG. 4 is also 1.5 percent or more.

  The front end portion 111 of the leading pipe 110 may include a portion formed in a cutting blade shape. The portion formed in the shape of a cutting blade enables vegetation and tree root cutting when being pushed into the ground, thereby contributing to a smooth entry of the top pipe 110 into the ground. The front end portion 111 is not necessarily provided with the lid portion 114. For example, the pipe may be processed so as to be crushed at one end of the leading pipe 110 and closed.

  A modification in the case where the drainage pipe set 100 includes the second subsequent pipe 130 that is one of the additional subsequent pipes will be described with reference to FIG. The second succeeding pipe 130 has both ends in the longitudinal direction, like the first succeeding pipe 120, and they are referred to as a third end 131 and a fourth end 132. Since the second succeeding pipe 130 is one of the additional succeeding pipes, as described above, the outer periphery and the hollow portion in the pipe have an oval shape in the cross section perpendicular to the longitudinal direction, and a plurality of drain holes 113 (not shown) are provided. ing. The length in the longitudinal direction of the second subsequent pipe 130 may be set as appropriate.

  The second end 122 of the first succeeding pipe 120 is formed by expanding the inner and outer diameters while maintaining an oval cross section by tube expansion processing. As a result, the third end 131 of the second subsequent pipe 130 can be inserted into the second end 122 of the first subsequent pipe 120. Therefore, as shown in FIG. 7, the leading pipe 110, the first succeeding pipe 120, and the second succeeding pipe 130 can be connected in series in this order to form the drain pipe 152. With respect to the vertical direction in FIG. 7, the first subsequent pipe 120 may be movable with respect to the second subsequent pipe 130 in the same manner as the leading pipe 110 is movable with respect to the first subsequent pipe 120. You don't have to.

  The drainage pipe 152 can be installed by being advanced further into the ground 20 than the drainage pipe 150 shown in FIG. It is the same as the drainage pipe 150 in that it can be installed with an inclination at an angle suitable for drainage in order from the top pipe 110 when entering. Another additional succeeding pipe can be connected to the fourth end 132 of the second succeeding pipe 130 to form a further drained water pipe.

  According to Example 1, except for the case where the natural ground is harder than a certain level, a drainage pipe having an oval cross section with excellent drainage performance is obtained without requiring a preparation step such as drilling the natural ground. It can be installed underground with an appropriate slope. In addition, it is possible to suppress the deterioration of the drainage pipe over time and the accumulation of earth and sand in the pipe.

  A second embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a diagram illustrating an appearance of a drain pipe set 200 according to the second embodiment. The drain pipe set 200 includes a leading pipe 210, a first subsequent pipe 220, and a second subsequent pipe 230. The longitudinal direction of the leading pipe 210, the first succeeding pipe 220, and the second succeeding pipe 230 is indicated by broken arrows at the bottom of FIG. The top pipe 210, the first subsequent pipe 220, and the second subsequent pipe 230 are all metal hollow pipes.

  The leading pipe 210 has a front end portion 211 and a rear end portion 212, and is provided with a plurality of drain holes 213 penetrating from the outside to the inside of the pipe except for the lower portion in FIG. A lid 214 shown with hatching is attached to the front end 211, and the leading pipe 210 is closed by the lid 214 at the front end 211. The pipe end of the rear end portion 212 is not shown in FIG.

  The first succeeding pipe 220 has a first end 221 and a second end 222, and a plurality of drain holes 213 penetrating from the outside to the inside of the pipe except for the lower portion in FIG. . The second succeeding pipe 230 has a third end 231 and a fourth end 232, and a plurality of drain holes 213 penetrating from the outside to the inside of the pipe except for the lower part in FIG. . The pipe ends of the second end portion 222 and the fourth end portion 232 are not shown in FIG.

  The leading pipe 210, the first succeeding pipe 220, and the second succeeding pipe 230 are similar to the leading pipe 110 and the first succeeding pipe 120 of the first embodiment, respectively, in the outer periphery and the hollow portion in the pipe in the cross section perpendicular to the longitudinal direction. Form an egg shape. The longitudinal lengths of the leading pipe 210 and the second succeeding pipe 230 may be set as appropriate. It is assumed that the first subsequent pipe 220 is formed shorter in the longitudinal direction than the second subsequent pipe 230.

  As in the case of the leading pipe 110 of the first embodiment, the leading pipe 210 is such that the top of the egg-shaped side having the larger curvature radius protrudes from the top of the side having the smaller curvature radius at the front end portion 211. The degree of the protrusion is the same as that described with reference to FIG. The drainage pipe set 200 may or may not include a metal hollow additional succeeding pipe (not shown) in addition to the leading pipe 210, the first succeeding pipe 220, and the second succeeding pipe 230.

  The leading pipe 210, the first succeeding pipe 220, and the second succeeding pipe 230 (and possibly each additional succeeding pipe not shown) may be connected in series in this order to form a drain pipe. In the same manner as the rear end portion 112 of the first embodiment, the rear end portion 212 of the first pipe 210 has an inner and outer diameter enlarged while maintaining an oval cross section, and the first end portion 221 of the first subsequent pipe 220 is inserted. In some cases, the hollow portion in the tube having an oval cross section is formed in advance so as to maintain a predetermined interval with respect to the outer periphery of the first end 221 at each of the apexes on the large and small curvature radii. As a result, the longitudinal direction of the leading pipe 210 when the first end portion 221 is inserted into the rear end portion 212 is the same as the longitudinal direction of the first subsequent pipe 220 as described in the first embodiment. In contrast, it is movable. For example, rivets, bolts / nuts, or screws may be provided between the rear end portion 212 and the first end portion 221 as in the first embodiment.

  The second end 222 of the first succeeding pipe 220 is expanded in inner and outer diameters while maintaining an oval cross section in the same manner as the rear end 212 of the leading pipe 210, and the third end 231 of the second succeeding pipe 230. The hollow part in the tube having an oval cross section is formed in advance so as to maintain a predetermined interval with respect to the outer periphery of the third end part 231 at each of the apexes on the large and small curvature radii. As a result, the longitudinal direction of the first subsequent pipe 220 when the third end portion 231 is inserted into the second end portion 222 is the longitudinal direction of the second subsequent pipe 230 as described in the first embodiment. It is movable with respect to the direction. For example, rivets, bolts / nuts or screws may be fastened between the second end 222 and the third end 231 in the same manner as in the first embodiment.

  The operation of the drain pipe 250 formed by connecting the top pipe 210, the first subsequent pipe 220, and the second subsequent pipe 230 as described above will be described. FIG. 9 is a diagram illustrating a state in which the drain pipe 250 is press-fitted into the ground from the slope of the natural ground 20. Since the drain pipe 250 is made of metal and has high rigidity, the front end portion 211 of the leading pipe 210 is directed to the slope of the natural ground, and the fourth end portion 232 of the second succeeding pipe 230 is formed using a drilling machine or the like. The drain pipe 250 can be installed in the ground of the natural ground 20 by applying pressure and pushing in. Except for the case where the natural ground is harder than a certain level, a preparatory step for previously drilling the natural ground or providing a guide tube is not necessary.

  At this time, the front end portion 211 of the leading pipe 210 has a curvature with a protruding tip by directing the top portion of each pipe oval section having the larger curvature radius and the top portion having the smaller curvature radius upward and downward, respectively. Proceeding underground with the top of the radius side up. Accordingly, an upward force acts on the front end portion 211 as the leading pipe 210 moves forward. Further, with respect to the vertical direction in FIG. 9, as described with reference to FIG. 5 of the first embodiment, the leading pipe 210 is movable within a certain range with respect to the first subsequent pipe 220. The succeeding pipe 220 is movable within a certain range with respect to the second succeeding pipe 230.

  As a result, when pressure is applied to the fourth end 232 of the second succeeding pipe 230 in the horizontal plane and the drain pipe 250 is pushed toward the slope of the natural ground 20, the leading pipe 210 gradually moves upward, As it is pushed toward the deep part of the head 20, the front end part 211 is inclined upward. As the first subsequent pipe 220 connected to the leading pipe 210 at the first end 221 is pushed toward the deep part of the natural ground 20, the first end 221 is inclined upward, and further the third end The second succeeding pipe 230 connected to the first succeeding pipe 220 at 231 is inclined with the third end 231 facing upward as it is pushed toward the deep part of the natural ground 20.

  Since the front end portion 211 of the leading pipe 210 is closed by a lid portion 214 (not shown in FIG. 9), entry and accumulation of earth and sand into the drainage pipe 250 are prevented. The first end 221 of the first subsequent pipe 220 and the third end 231 of the second subsequent pipe 230 are inserted into the rear end 212 of the leading pipe 210 and the second end 222 of the first subsequent pipe 220, respectively. Therefore, it is possible to prevent earth and sand from entering the pipe from each connection point between the pipes as the drain pipe 150 is pressed into the ground 20.

  That is, as shown in FIG. 9, the drain pipe 250 is inclined with the front end portion facing up, and the connecting portion between the rear end portion 212 and the first end portion 221, and the second end portion 222 and the third end portion 231. It is installed in the ground of the natural ground 20 in a state where it is gently refracted at each of the connection points. The leading pipe 210, the first succeeding pipe 220 and the second succeeding pipe 230 are each provided with a plurality of drain holes 213 penetrating from the outside to the inside of the pipe (not shown in FIG. 9). The water in the ground 20 oozes out into the drainage pipe 250 through the drainage hole 213.

  In the same manner as in the first embodiment, the moisture exuded into the pipe is discharged to the ground through the fourth end 232 of the second succeeding pipe 230 after descending the inclination of the drain pipe 250. The point that the drain pipe 250 exhibits the drainage performance utilizing the characteristics of the oval tube is the same as that of the first embodiment. The front end portion 211 of the leading pipe 210 may include a portion formed in a cutting blade shape. The front end portion 211 is not necessarily provided with the lid portion 214, and may be closed by processing to crush the tube at one end of the leading pipe 210, for example.

  When the drain pipe set 200 includes an additional succeeding pipe, one or more additional succeeding pipes may be further connected at the fourth end 232 that is the rear end of the drain pipe 250. The additional succeeding pipe to be connected may be, for example, the same pipe as the second succeeding pipe 130 according to the modification of the first embodiment, and the first succeeding pipe 220 according to the second embodiment and the second succeeding pipe according to the modification of the first embodiment. The pipe 130 may be connected in series.

  The drainage pipe 150 according to the first embodiment and the drainage pipe 250 according to the second embodiment have been described on the assumption that a plurality of drainage holes 113 or 213 are provided in all the pipes constituting the drainage pipe 150. However, if a certain number of drain holes are provided over the entire length of the drain pipe, it is not always necessary to provide the drain holes in all the pipes.

  According to the second embodiment, even when the number of succeeding pipes is increased to extend the drainage pipe, an additional effect of facilitating installation in the ground with the top facing upward can be obtained.

20 Ground 100, 200 Drain pipe set 110, 210 Lead pipe 111, 211 Front end 112, 212 Rear end 113, 213 Drain hole 114, 214 Lid 115 First top 116 Second top 120, 220 First 1 Subsequent pipe 121,221 1st end part 122,222 2nd end part 130,230 2nd subsequent pipe 131,231 3rd end part 132,232 4th end part 150,152,250 Drain pipe

Claims (7)

A plurality of metal pipes having an oval shape having a radius of curvature of the first top portion that is larger than a curvature radius of the second top portion facing each other in a cross section perpendicular to the longitudinal direction, and at least one of the metal pipes from the outside of the pipe to the inside In a pipe set for a water drain pipe comprising a plurality of metal pipes that are provided with a water drain hole penetrating to and connected to each other in series.
Has a front end and a rear end portion in the longitudinal direction A 1 of the plurality of metal pipes, the front end of the first of said longitudinal than lateral side of the top portion and the second apex with is closed A leading pipe protruding in the direction ,
The top pipe by said first end portion is inserted into the rear end while closed a first end and a second end in the longitudinal direction A 1 of the plurality of metal pipes And when connected to the leading pipe, the first top portion and the second top portion each have a predetermined distance between the outer periphery of the first end portion and the rear end portion. A drainage pipe set comprising a first succeeding pipe formed so as to be able to keep a distance . Wherein by said third end while have a third end and a fourth end portion is inserted into the second end in the longitudinal direction A 1 of the plurality of metal pipes An outer periphery of the third end and the second at the first top and the second top when connected to the first subsequent pipe and when connected to the first subsequent pipe; The drainage pipe set according to claim 1, further comprising a second succeeding pipe formed so as to be able to maintain a predetermined distance from each other . The length of the second succeeding pipe from the third end to the fourth end is longer than the length from the first end to the second end of the first succeeding pipe. The pipe set for a drain pipe according to claim 2, wherein the pipe set is also larger . The predetermined interval is 1.5 with respect to the length in the longitudinal direction corresponding to the insertion depth when the first end of the first subsequent pipe is inserted into the rear end of the leading pipe. 2. The pipe set for a drain pipe according to claim 1 , wherein the pipe set has a value of percent or more.   The drain pipe pipe set according to claim 1, wherein the top pipe includes a lid portion attached so as to close the front end portion.   The drain pipe pipe set according to claim 1, wherein the front end portion of the leading pipe includes a portion formed in a cutting edge shape. A plurality of metal pipes having an oval shape having a radius of curvature of the first top portion that is larger than a curvature radius of the second top portion facing each other in a cross section perpendicular to the longitudinal direction, and at least one of the metal pipes from the outside of the pipe to the inside Among the pipe sets for water drain pipes comprising a plurality of metal pipes that are provided with a water drain hole penetrating to and connected to each other in series, a front end portion in the longitudinal direction The plurality of metal parts are disposed on the rear end portion of the leading pipe having a rear end portion, the front end portion being closed and the first top portion projecting in the longitudinal direction from the second top portion. said first end is connected to the head pipe by being inserted into the rear end portion with a first pipe for chromatic a first end and a second end in the longitudinal direction And the top pipe First, each between the outer peripheral and the rear end portion of the first end portion in said first apex and said second apex when coupled is formed so as to be able to maintain a predetermined distance Inserting the first end of the trailing pipe;
Connecting the plurality of metal pipes including the leading pipe and the first succeeding pipe in series to form the drain pipe;
Directing the drain pipe toward the direction of inserting the first top portion and the second top portion upward and downward, respectively, and sequentially inserting from the top pipe to the natural ground,
A method for installing a drain pipe, wherein the drain pipe is press-fitted into the ground along the direction in which the drain pipe is inserted into the ground.

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